How to use the S3 Feral Chest ?Follow

Greetings everybody =)

I need some advises. I'm a feral, currently at the end of ssc/tk, and i hesitate a lot concerning the use i should make of the wonderful s3 chest.

As a lot of druids, my guild don't return very oftenly to maghteridon, so i don't have the T4 chest for my tank gear, and we don't kill Kael'Thas yet and i'm pretty sure that some warriors, priests and maybe other druids will get the t5 before me when it will drop. So i wear the Heavy Clefthoof Vest, with 3 x + 12 stamina gems, and +150 health enchant (that is a total of 81 stamina + 150 health). It's good for tanking, yes, but it lacks of strength/agility for threat generation and of course agility for dodge, and i'm fed up to wear this item since i started to tank normal instances.

So my idea was to take the s3 chest and gem and enchant it for tanking. I have it, with +6 to all stats (that is a better enchant for tanking than +150hp, and it will help me also in arena). But i've read so many topics where the s3 chest is described as one of the best for dps that i'm hesitating a lot about the gems that i should use. And indeed, without gems on it, when i wear it, i lost "just" 37 attack power, 10 hit, but have 0.6% critic more than my Chestguard of the Conniver.

Should i go for 3 x 12 stamina for a full tank and arena chest ? (54 + 36 = 90, so more than my previous one) For a mix of 2 x +12 stamina and 1 x +8 agility for an all-purpose tank oriented chest ? (78 stamina, a little bit less that mine, and + 8 agility, i don't know if gemmed like that, the chest is good for dps) For 2 x +4agi/+6stam and 1x +4agi/4hit for an hybrid chest but more dps oriented (66 stamina, 15 less that mine, +12 agi, and +4 hit + the socket bonus) or for 2 x +8agi and 1 x +4agi/4hit for a pure dps chest (54 stamina, 26 less that mine, +20agi, +4 hit, and the socket bonus) ?

Even if i gem it for dps, i think that i'll use it to tank because of the armor, the high stamina in it, the resilience, and the threat generation stats (strength and agility). But i'll fall from 15,8k stam with clefthoof self-buff, to 15,3k with the s3 chest gemmed for dps, so 500 health less, that is huge.

So what should i do ? Is there a good mix of gems that will make of this chest a very good one for dps, but also a clear improvement over mine for tanking, without loosing too much stamina ?

I have also a Bloodsea Brigand's Vest looted recently, but not gemmed. As i see in many sites, this chest is not a clear improvement over mine for dps, but maybe it's still better than a pure tanking or hybrid gemmed s3 chest ?

Thanks in advance for your advises =)